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doc/FTDI-EEPROM-format: document string descriptors
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 24 Sep 2023 22:27:38 +0000
parents 825d3303b886
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 There are a number of ready-made FTDI EEPROM config files shipped with
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2 fc-usbser-tools package, intended to serve as inputs to ftee-gen* tools. This
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3 article describes these shipped EEPROM configs.
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4
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5 duart28c and duart28s
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6 =====================
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7
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8 FreeCalypso DUART28 is an FT2232D-based custom hardware adapter produced in
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9 year 2020. There are two valid EEPROM configs for this adapter, named DUART28C
825d3303b886 doc/Shipped-EEPROM-configs: new article
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10 and DUART28S - see DUART28-EEPROM-config article for further details.
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11
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12 ft2232-example
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13 ==============
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14
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15 This config file is an example EEPROM config for FT2232x chips, valid for both
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16 FT2232C/D and FT2232H. It is intended to serve as a starting point for custom
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17 FT2232x EEPROM configurations.
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18
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19 ft232r-example
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20 ==============
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21
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22 This config file is an example EEPROM config for FT232R. It is intended to
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23 serve as a starting point for custom FT232R EEPROM configs.
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24
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25 icestick
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26 ========
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27
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28 Lattice iCEstick is a handy FPGA board with an FT2232H USB interface chip,
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29 supporting SPI programming via MPSSE on Channel A and UART communication with
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30 user logic via FT2232H Channel B. However, instead of programming this FT2232H
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31 chip's EEPROM with a distinctive USB VID:PID which Linux kernel ftdi_sio driver
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32 can recognize as a JTAG quirk, Lattice ships these boards with blank EEPROMs,
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33 causing the usual well-known problems with unquirked ftdi_sio binding.
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34
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35 Our supplied EEPROM config named "icestick" is intended as the solution:
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36 program it into the EEPROM on your iCEstick board, and the binding of ftdi_sio
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37 driver becomes sensible, with a ttyUSB device created only for Channel B.
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38
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39 jtag-unbuf
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40 ==========
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41
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42 This EEPROM config is meant for generic (non-specialized) FT2232D breakout
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43 boards used as unbuffered JTAG adapters, as described in this old guide
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44 from 2019:
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45
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46 https://www.freecalypso.org/hg/freecalypso-hwlab/file/tip/doc/Unbuffered-FT2232x-JTAG
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47
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48 mcu-host-bus
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49 ============
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50
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51 This EEPROM config is meant for the same generic FT2232D breakout boards used
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52 in MCU host bus emulation mode, which takes up both channels and leaves no UART.